1990647290 has 32 divisors (see below), whose sum is σ = 3901824000. Its totient is φ = 728336448.

The previous prime is 1990647287. The next prime is 1990647331. The reversal of 1990647290 is 927460991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175130 + ... + 186149.

It is an arithmetic number, because the mean of its divisors is an integer number (121932000).

Almost surely, 2^1990647290 is an apocalyptic number.

1990647290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990647290 is a deficient number, since it is larger than the sum of its proper divisors (1911176710).

1990647290 is a wasteful number, since it uses less digits than its factorization.

1990647290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361334.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 1990647290 is about 44616.6705391606. The cubic root of 1990647290 is about 1257.9540345133.

The spelling of 1990647290 in words is "one billion, nine hundred ninety million, six hundred forty-seven thousand, two hundred ninety".